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pock: Use floor division on integers.
[catacomb-python] / ec.c
1 /* -*-c-*-
2 *
3 * Elliptic curves
4 *
5 * (c) 2004 Straylight/Edgeware
6 */
7
8 /*----- Licensing notice --------------------------------------------------*
9 *
10 * This file is part of the Python interface to Catacomb.
11 *
12 * Catacomb/Python is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * Catacomb/Python is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with Catacomb/Python; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 */
26
27 /*----- Header files ------------------------------------------------------*/
28
29 #include "catacomb-python.h"
30
31 /*----- Utility functions -------------------------------------------------*/
32
33 PyTypeObject *ecpt_pytype;
34 PyTypeObject *ecptcurve_pytype;
35 PyTypeObject *eccurve_pytype;
36 PyTypeObject *ecprimecurve_pytype;
37 PyTypeObject *ecprimeprojcurve_pytype;
38 PyTypeObject *ecbincurve_pytype;
39 PyTypeObject *ecbinprojcurve_pytype;
40 PyTypeObject *ecinfo_pytype;
41
42 ec_curve *eccurve_copy(ec_curve *c)
43 {
44 field *f;
45 mp *a, *b;
46
47 if ((f = field_copy(c->f)) == 0)
48 return (0);
49 a = F_OUT(f, MP_NEW, c->a);
50 b = F_OUT(f, MP_NEW, c->b);
51 if (STRCMP(EC_NAME(c), ==, "prime"))
52 c = ec_prime(f, a, b);
53 else if (STRCMP(EC_NAME(c), ==, "primeproj"))
54 c = ec_primeproj(f, a, b);
55 else if (STRCMP(EC_NAME(c), ==, "bin"))
56 c = ec_bin(f, a, b);
57 else if (STRCMP(EC_NAME(c), ==, "binproj"))
58 c = ec_binproj(f, a, b);
59 else
60 c = 0;
61 MP_DROP(a);
62 MP_DROP(b);
63 if (!c) F_DESTROY(f);
64 return (c);
65 }
66
67 static PyObject *ecpt_dopywrap(PyObject *cobj, ec_curve *c, ec *p)
68 {
69 ecpt_pyobj *z = PyObject_New(ecpt_pyobj, (PyTypeObject *)cobj);
70 z->p = *p;
71 z->c = c;
72 Py_INCREF(cobj);
73 return ((PyObject *)z);
74 }
75
76 PyObject *ecpt_pywrap(PyObject *cobj, ec *p)
77 { return (ecpt_dopywrap(cobj, ECCURVE_C(cobj), p)); }
78
79 PyObject *ecpt_pywrapout(void *cobj, ec *p)
80 {
81 ec_curve *c;
82
83 if (!PyType_IsSubtype(cobj, ecptcurve_pytype))
84 c = 0;
85 else {
86 c = ECCURVE_C(cobj);
87 EC_IN(ECCURVE_C(cobj), p, p);
88 }
89 return (ecpt_dopywrap(cobj, c, p));
90 }
91
92 int toecpt(ec_curve *c, ec *d, PyObject *p)
93 {
94 if (ECPTCURVE_PYCHECK(p)) {
95 if (ECPT_C(p) != c && !ec_samep(ECPT_C(p), c))
96 return (-1);
97 EC_COPY(d, ECPT_P(p));
98 } else if (ECPT_PYCHECK(p))
99 EC_IN(c, d, ECPT_P(p));
100 else
101 return (-1);
102 return (0);
103 }
104
105 int getecpt(ec_curve *c, ec *d, PyObject *p)
106 {
107 if (toecpt(c, d, p)) {
108 PyErr_Format(PyExc_TypeError, "can't convert %.100s to ecpt",
109 p->ob_type->tp_name);
110 return (-1);
111 }
112 return (0);
113 }
114
115 void getecptout(ec *d, PyObject *p)
116 {
117 if (ECPTCURVE_PYCHECK(p))
118 EC_OUT(ECPT_C(p), d, ECPT_P(p));
119 else {
120 assert(ECPT_PYCHECK(p));
121 EC_COPY(d, ECPT_P(p));
122 }
123 }
124
125 int convecpt(PyObject *o, void *p)
126 {
127 if (!ECPT_PYCHECK(o))
128 TYERR("want elliptic curve point");
129 getecptout(p, o);
130 return (1);
131 end:
132 return (0);
133 }
134
135 /*----- Curve points ------------------------------------------------------*/
136
137 static int ecbinop(PyObject *x, PyObject *y,
138 ec_curve **c, PyObject **cobj, ec *xx, ec *yy)
139 {
140 if (ECPTCURVE_PYCHECK(x)) *cobj = ECPT_COBJ(x);
141 else if (ECPTCURVE_PYCHECK(y)) *cobj = ECPT_COBJ(y);
142 else return (-1);
143 *c = ECCURVE_C(*cobj);
144 if (toecpt(*c, xx, x) || toecpt(*c, yy, y)) return (-1);
145 return (0);
146 }
147
148 #define BINOP(name) \
149 static PyObject *ecpt_py##name(PyObject *x, PyObject *y) { \
150 ec xx = EC_INIT, yy = EC_INIT, zz = EC_INIT; \
151 PyObject *cobj; \
152 ec_curve *c; \
153 if (ecbinop(x, y, &c, &cobj, &xx, &yy)) RETURN_NOTIMPL; \
154 c->ops->name(c, &zz, &xx, &yy); \
155 EC_DESTROY(&xx); EC_DESTROY(&yy); \
156 return (ecpt_pywrap(ECPT_COBJ(x), &zz)); \
157 }
158 BINOP(add)
159 BINOP(sub)
160 #undef BINOP
161
162 #define UNOP(name) \
163 static PyObject *ecpt_py##name(PyObject *x) { \
164 ec zz = EC_INIT; \
165 ec_curve *c = ECPT_C(x); \
166 c->ops->name(c, &zz, ECPT_P(x)); \
167 return (ecpt_pywrap(ECPT_COBJ(x), &zz)); \
168 }
169 UNOP(neg)
170 #undef UNOP
171
172 static PyObject *ecpt_pyid(PyObject *x) { RETURN_OBJ(x); }
173
174 static int ecpt_pynonzerop(PyObject *x) { return (!EC_ATINF(ECPT_P(x))); }
175
176 static void ecpt_pydealloc(PyObject *x)
177 {
178 EC_DESTROY(ECPT_P(x));
179 Py_DECREF(ECPT_COBJ(x));
180 FREEOBJ(x);
181 }
182
183 static PyObject *ecpt_pymul(PyObject *x, PyObject *y)
184 {
185 mp *xx;
186 ec zz = EC_INIT;
187
188 if (ECPT_PYCHECK(x)) { PyObject *t; t = x; x = y; y = t; }
189 if (!ECPT_PYCHECK(y) || (xx = tomp(x)) == 0) RETURN_NOTIMPL;
190 ec_imul(ECPT_C(y), &zz, ECPT_P(y), xx);
191 MP_DROP(xx);
192 return (ecpt_pywrap(ECPT_COBJ(y), &zz));
193 }
194
195 static Py_hash_t ecpt_pyhash(PyObject *me)
196 {
197 uint32 h;
198 ec p = EC_INIT;
199
200 getecptout(&p, me);
201 if (EC_ATINF(&p)) h = 0x81d81a94;
202 else h = 0xe0fdd039 ^ (2*mphash(p.x)) ^ (3*mphash(p.y));
203 EC_DESTROY(&p);
204 return (h%LONG_MAX);
205 }
206
207 static PyObject *ecpt_pyrichcompare(PyObject *x, PyObject *y, int op)
208 {
209 ec p = EC_INIT, q = EC_INIT;
210 int b;
211 PyObject *rc = 0;
212
213 if (!ECPT_PYCHECK(y)) RETURN_NOTIMPL;
214 getecptout(&p, x);
215 getecptout(&q, y);
216 switch (op) {
217 case Py_EQ: b = EC_EQ(&p, &q); break;
218 case Py_NE: b = !EC_EQ(&p, &q); break;
219 default: TYERR("elliptic curve points are unordered");
220 }
221 rc = getbool(b);
222 end:
223 EC_DESTROY(&p);
224 EC_DESTROY(&q);
225 return (rc);
226 }
227
228 static PyObject *epmeth_oncurvep(PyObject *me)
229 {
230 return (getbool(EC_ATINF(ECPT_P(me)) ||
231 !EC_CHECK(ECPT_C(me), ECPT_P(me))));
232 }
233
234 static PyObject *epmeth_dbl(PyObject *me)
235 {
236 ec p = EC_INIT;
237 EC_DBL(ECPT_C(me), &p, ECPT_P(me));
238 return (ecpt_pywrap(ECPT_COBJ(me), &p));
239 }
240
241 static PyObject *epmeth_tobuf(PyObject *me)
242 {
243 buf b;
244 ec p = EC_INIT;
245 PyObject *rc;
246 size_t n;
247
248 getecptout(&p, me);
249 if (EC_ATINF(&p))
250 n = 2;
251 else
252 n = mp_octets(p.x) + mp_octets(p.y) + 6;
253 rc = bytestring_pywrap(0, n);
254 buf_init(&b, BIN_PTR(rc), n);
255 buf_putec(&b, &p);
256 assert(BOK(&b));
257 BIN_SETLEN(rc, BLEN(&b));
258 EC_DESTROY(&p);
259 return (rc);
260 }
261
262 static PyObject *epmeth_toraw(PyObject *me)
263 {
264 buf b;
265 PyObject *rc;
266 char *p;
267 ec_curve *c = ECPT_C(me);
268 ec pp = EC_INIT;
269 int len;
270
271 len = c->f->noctets * 2 + 1;
272 rc = bytestring_pywrap(0, len);
273 p = BIN_PTR(rc);
274 buf_init(&b, p, len);
275 EC_OUT(c, &pp, ECPT_P(me));
276 ec_putraw(c, &b, &pp);
277 EC_DESTROY(&pp);
278 BIN_SETLEN(rc, BLEN(&b));
279 return (rc);
280 }
281
282 static PyObject *epmeth_ec2osp(PyObject *me, PyObject *arg, PyObject *kw)
283 {
284 buf b;
285 PyObject *rc;
286 char *p;
287 ec_curve *c = ECPT_C(me);
288 ec pp = EC_INIT;
289 unsigned f = EC_EXPLY;
290 int len;
291 static const char *const kwlist[] = { "flags", 0 };
292
293 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:ec2osp", KWLIST,
294 convuint, &f))
295 return (0);
296 len = c->f->noctets * 2 + 1;
297 rc = bytestring_pywrap(0, len);
298 p = BIN_PTR(rc);
299 buf_init(&b, p, len);
300 EC_OUT(c, &pp, ECPT_P(me));
301 if (ec_ec2osp(c, f, &b, &pp)) {
302 Py_DECREF(rc); rc = 0;
303 VALERR("invalid flags");
304 }
305 EC_DESTROY(&pp);
306 BIN_SETLEN(rc, BLEN(&b));
307 end:
308 return (rc);
309 }
310
311 static PyObject *epmeth_frombuf(PyObject *me, PyObject *arg)
312 {
313 struct bin in;
314 buf b;
315 PyObject *rc = 0;
316 ec pp = EC_INIT;
317
318 if (!PyArg_ParseTuple(arg, "O&:frombuf", convbin, &in)) goto end;
319 buf_init(&b, (/*unconst*/ void *)in.p, in.sz);
320 if (buf_getec(&b, &pp)) VALERR("malformed data");
321 rc = Py_BuildValue("(NN)", ecpt_pywrapout(me, &pp),
322 bytestring_pywrapbuf(&b));
323 end:
324 return (rc);
325 }
326
327 static PyObject *epmeth_parse(PyObject *me, PyObject *arg)
328 {
329 char *p;
330 qd_parse qd;
331 PyObject *rc = 0;
332 ec pp = EC_INIT;
333
334 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
335 qd.p = p; qd.e = 0;
336 if (!ec_ptparse(&qd, &pp)) VALERR(qd.e);
337 rc = Py_BuildValue("(Ns)", ecpt_pywrapout(me, &pp), qd.p);
338 end:
339 return (rc);
340 }
341
342 static PyObject *epmeth_fromraw(PyObject *me, PyObject *arg)
343 {
344 struct bin in;
345 buf b;
346 PyObject *rc = 0;
347 ec_curve *cc;
348 ec pp = EC_INIT;
349
350 if (!PyArg_ParseTuple(arg, "O&:fromraw", convbin, &in)) return (0);
351 buf_init(&b, (/*unconst*/ void *)in.p, in.sz);
352 cc = ECCURVE_C(me);
353 if (ec_getraw(cc, &b, &pp))
354 VALERR("bad point");
355 EC_IN(cc, &pp, &pp);
356 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
357 end:
358 return (rc);
359 }
360
361 static PyObject *epmeth_os2ecp(PyObject *me, PyObject *arg, PyObject *kw)
362 {
363 struct bin in;
364 buf b;
365 PyObject *rc = 0;
366 ec_curve *cc;
367 unsigned f = EC_XONLY | EC_LSB | EC_SORT | EC_EXPLY;
368 ec pp = EC_INIT;
369 static const char *const kwlist[] = { "buf", "flags", 0 };
370
371 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&|O&:os2ecp", KWLIST,
372 convbin, &in, convuint, &f))
373 return (0);
374 buf_init(&b, (/*unconst*/ void *)in.p, in.sz);
375 cc = ECCURVE_C(me);
376 if (ec_os2ecp(cc, f, &b, &pp)) VALERR("bad point");
377 EC_IN(cc, &pp, &pp);
378 rc = Py_BuildValue("(NN)", ecpt_pywrap(me, &pp), bytestring_pywrapbuf(&b));
379 end:
380 return (rc);
381 }
382
383 static PyObject *epncget_ix(PyObject *me, void *hunoz)
384 {
385 ec p = EC_INIT;
386 PyObject *rc;
387 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
388 getecptout(&p, me);
389 rc = mp_pywrap(MP_COPY(p.x));
390 EC_DESTROY(&p);
391 return (rc);
392 }
393
394 static PyObject *epncget_iy(PyObject *me, void *hunoz)
395 {
396 ec p = EC_INIT;
397 PyObject *rc;
398 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
399 getecptout(&p, me);
400 rc = mp_pywrap(MP_COPY(p.y));
401 EC_DESTROY(&p);
402 return (rc);
403 }
404
405 static PyObject *epncget_point(PyObject *me, void *hunoz)
406 { RETURN_ME; }
407
408 static PyObject *epget_point(PyObject *me, void *hunoz)
409 {
410 ec p = EC_INIT;
411 getecptout(&p, me);
412 return (ecpt_pywrapout(ecpt_pytype, &p));
413 }
414
415 static PyObject *epget_x(PyObject *me, void *hunoz)
416 {
417 ec_curve *c = ECPT_C(me);
418 ec *pp = ECPT_P(me);
419 PyObject *fobj = ECPT_FOBJ(me);
420 ec p = EC_INIT;
421 PyObject *rc;
422
423 if (EC_ATINF(pp)) RETURN_NONE;
424 EC_OUT(c, &p, pp);
425 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.x));
426 EC_DESTROY(&p);
427 return (rc);
428 }
429
430 static PyObject *epget_y(PyObject *me, void *hunoz)
431 {
432 ec_curve *c = ECPT_C(me);
433 ec *pp = ECPT_P(me);
434 PyObject *fobj = ECPT_FOBJ(me);
435 ec p = EC_INIT;
436 PyObject *rc;
437
438 if (EC_ATINF(pp)) RETURN_NONE;
439 EC_OUT(c, &p, pp);
440 rc = fe_pywrap(fobj, F_IN(c->f, MP_NEW, p.y));
441 EC_DESTROY(&p);
442 return (rc);
443 }
444
445 static PyObject *epget__x(PyObject *me, void *hunoz)
446 {
447 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
448 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->x)));
449 }
450
451 static PyObject *epget__y(PyObject *me, void *hunoz)
452 {
453 if (EC_ATINF(ECPT_P(me))) RETURN_NONE;
454 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->y)));
455 }
456
457 static PyObject *epget__z(PyObject *me, void *hunoz)
458 {
459 if (EC_ATINF(ECPT_P(me)) || !ECPT_P(me)->z) RETURN_NONE;
460 return (fe_pywrap(ECPT_FOBJ(me), MP_COPY(ECPT_P(me)->z)));
461 }
462
463 static mp *coord_in(field *f, PyObject *x)
464 {
465 mp *xx;
466 if (FE_PYCHECK(x) && FE_F(x) == f)
467 return (MP_COPY(FE_X(x)));
468 else if ((xx = getmp(x)) == 0)
469 return (0);
470 else
471 return (F_IN(f, xx, xx));
472 }
473
474 static int ecptxl_3(ec_curve *c, ec *p,
475 PyObject *x, PyObject *y, PyObject *z)
476 {
477 int rc = -1;
478
479 if (!x || !y || !z) TYERR("missing argument");
480 if (!c) VALERR("internal form with no curve!");
481 if ((p->x = coord_in(c->f, x)) == 0 ||
482 (p->y = coord_in(c->f, y)) == 0 ||
483 (z != Py_None && (p->z = coord_in(c->f, z)) == 0))
484 goto end;
485 if (!p->z) p->z = MP_COPY(c->f->one); /* just in case */
486 rc = 0;
487 end:
488 return (rc);
489 }
490
491 static int ecptxl_2(ec_curve *c, ec *p, PyObject *x, PyObject *y)
492 {
493 int rc = -1;
494
495 if (!x || !y) TYERR("missing argument");
496 if ((p->x = getmp(x)) == 0 ||
497 (p->y = getmp(y)) == 0)
498 goto end;
499 if (c) EC_IN(c, p, p);
500 rc = 0;
501 end:
502 return (rc);
503 }
504
505 static int ecptxl_1(ec_curve *c, ec *p, PyObject *x)
506 {
507 int rc = -1;
508 PyObject *y = 0, *z = 0, *t = 0;
509 mp *xx = 0;
510 int n;
511 qd_parse qd;
512
513 Py_XINCREF(x);
514 if (!x || x == Py_None)
515 /*cool*/;
516 else if (ECPT_PYCHECK(x)) {
517 getecptout(p, x);
518 goto fix;
519 } else if (TEXT_CHECK(x)) {
520 qd.p = TEXT_PTR(x);
521 qd.e = 0;
522 if (!ec_ptparse(&qd, p))
523 VALERR(qd.e);
524 goto fix;
525 } else if (c && (xx = tomp(x)) != 0) {
526 xx = F_IN(c->f, xx, xx);
527 if (!EC_FIND(c, p, xx)) VALERR("not on the curve");
528 } else if (PySequence_Check(x)) {
529 t = x; x = 0;
530 n = PySequence_Size(t); if (n < 0) goto end;
531 if (n != 2 && (n != 3 || !c))
532 TYERR("want sequence of two or three items");
533 if ((x = PySequence_GetItem(t, 0)) == 0 ||
534 (y = PySequence_GetItem(t, 1)) == 0 ||
535 (n == 3 && (z = PySequence_GetItem(t, 2)) == 0))
536 goto end;
537 rc = (n == 2) ? ecptxl_2(c, p, x, y) : ecptxl_3(c, p, x, y, z);
538 goto end;
539 } else
540 TYERR("can't convert to curve point");
541 goto ok;
542
543 fix:
544 if (c) EC_IN(c, p, p);
545 ok:
546 rc = 0;
547 end:
548 Py_XDECREF(x); Py_XDECREF(y); Py_XDECREF(z); Py_XDECREF(t);
549 mp_drop(xx);
550 return (rc);
551 }
552
553 static int ecptxl(ec_curve *c, ec *p, PyObject *x, PyObject *y, PyObject *z)
554 {
555 if (z)
556 return (ecptxl_3(c, p, x, y, z));
557 else if (y)
558 return (ecptxl_2(c, p, x, y));
559 else
560 return (ecptxl_1(c, p, x));
561 }
562
563 static PyObject *ecptnc_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
564 {
565 PyObject *x = 0, *y = 0, *z = 0;
566 ec p = EC_INIT;
567 static const char *const kwlist[] = { "x", "y", 0 };
568
569 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OO:new", KWLIST, &x, &y) ||
570 ecptxl(0, &p, x, y, z))
571 goto end;
572 return (ecpt_pywrapout(ty, &p));
573 end:
574 mp_drop(p.x); mp_drop(p.y); mp_drop(p.z);
575 return (0);
576 }
577
578 static PyObject *ecpt_pyint(PyObject *me)
579 {
580 ec p = EC_INIT;
581 long l;
582 PyObject *rc = 0;
583 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
584 getecptout(&p, me);
585 if (!mp_tolong_checked(p.x, &l, 0)) rc = PyInt_FromLong(l);
586 else rc = mp_topylong(p.x);
587 end:
588 EC_DESTROY(&p);
589 return (rc);
590 }
591
592 static PyObject *ecpt_pylong(PyObject *me)
593 {
594 ec p = EC_INIT;
595 PyObject *rc = 0;
596 if (EC_ATINF(ECPT_P(me))) VALERR("point at infinity");
597 getecptout(&p, me);
598 rc = mp_topylong(p.x);
599 end:
600 EC_DESTROY(&p);
601 return (rc);
602 }
603
604 static PyObject *ecpt_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
605 {
606 PyObject *x = 0, *y = 0, *z = 0;
607 ec p = EC_INIT;
608 static const char *const kwlist[] = { "x", "y", "z", 0 };
609
610 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|OOO:new", KWLIST,
611 &x, &y, &z) ||
612 ecptxl(ECCURVE_C(ty), &p, x, y, z))
613 goto end;
614 return (ecpt_pywrap((PyObject *)ty, &p));
615 end:
616 mp_drop(p.x); mp_drop(p.y); mp_drop(p.z);
617 return (0);
618 }
619
620 static const PyGetSetDef ecptnc_pygetset[] = {
621 #define GETSETNAME(op, name) epnc##op##_##name
622 GET (ix, "P.ix -> integer x coordinate of P")
623 GET (iy, "P.iy -> integer y coordinate of P")
624 GET (point, "P.point -> standalone curve point (no-op)")
625 #undef GETSETNAME
626 { 0 }
627 };
628
629 static const PyMethodDef ecptnc_pymethods[] = {
630 #define METHNAME(func) epmeth_##func
631 NAMETH(tobuf, "X.tobuf() -> BIN")
632 CMTH (frombuf, "frombuf(STR) -> (P, REST)")
633 CMTH (parse, "parse(STR) -> (P, REST)")
634 #undef METHNAME
635 { 0 }
636 };
637
638 static const PyNumberMethods ecpt_pynumber = {
639 0, /* @nb_add@ */
640 0, /* @nb_subtract@ */
641 0, /* @nb_multiply@ */
642 0, /* @nb_divide@ */
643 0, /* @nb_remainder@ */
644 0, /* @nb_divmod@ */
645 0, /* @nb_power@ */
646 0, /* @nb_negative@ */
647 0, /* @nb_positive@ */
648 0, /* @nb_absolute@ */
649 ecpt_pynonzerop, /* @nb_nonzero@ */
650 0, /* @nb_invert@ */
651 0, /* @nb_lshift@ */
652 0, /* @nb_rshift@ */
653 0, /* @nb_and@ */
654 0, /* @nb_xor@ */
655 0, /* @nb_or@ */
656 0, /* @nb_coerce@ */
657 ecpt_pyint, /* @nb_int@ */
658 ecpt_pylong, /* @nb_long@ */
659 0, /* @nb_float@ */
660 0, /* @nb_oct@ */
661 0, /* @nb_hex@ */
662
663 0, /* @nb_inplace_add@ */
664 0, /* @nb_inplace_subtract@ */
665 0, /* @nb_inplace_multiply@ */
666 0, /* @nb_inplace_divide@ */
667 0, /* @nb_inplace_remainder@ */
668 0, /* @nb_inplace_power@ */
669 0, /* @nb_inplace_lshift@ */
670 0, /* @nb_inplace_rshift@ */
671 0, /* @nb_inplace_and@ */
672 0, /* @nb_inplace_xor@ */
673 0, /* @nb_inplace_or@ */
674
675 0, /* @nb_floor_divide@ */
676 0, /* @nb_true_divide@ */
677 0, /* @nb_inplace_floor_divide@ */
678 0, /* @nb_inplace_true_divide@ */
679 };
680
681 static const PyTypeObject ecpt_pytype_skel = {
682 PyVarObject_HEAD_INIT(0, 0) /* Header */
683 "ECPt", /* @tp_name@ */
684 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
685 0, /* @tp_itemsize@ */
686
687 ecpt_pydealloc, /* @tp_dealloc@ */
688 0, /* @tp_print@ */
689 0, /* @tp_getattr@ */
690 0, /* @tp_setattr@ */
691 0, /* @tp_compare@ */
692 0, /* @tp_repr@ */
693 PYNUMBER(ecpt), /* @tp_as_number@ */
694 0, /* @tp_as_sequence@ */
695 0, /* @tp_as_mapping@ */
696 ecpt_pyhash, /* @tp_hash@ */
697 0, /* @tp_call@ */
698 0, /* @tp_str@ */
699 0, /* @tp_getattro@ */
700 0, /* @tp_setattro@ */
701 0, /* @tp_as_buffer@ */
702 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
703 Py_TPFLAGS_CHECKTYPES |
704 Py_TPFLAGS_BASETYPE,
705
706 /* @tp_doc@ */
707 "ECPt([X, [Y]]): elliptic curve points, not associated with any curve.\n"
708 " X alone may be None, an existing point, a string 'X, Y', an\n"
709 " x-coordinate, or a pair (X, Y); X and Y should be a coordinate pair.",
710
711 0, /* @tp_traverse@ */
712 0, /* @tp_clear@ */
713 ecpt_pyrichcompare, /* @tp_richcompare@ */
714 0, /* @tp_weaklistoffset@ */
715 0, /* @tp_iter@ */
716 0, /* @tp_iternext@ */
717 PYMETHODS(ecptnc), /* @tp_methods@ */
718 0, /* @tp_members@ */
719 PYGETSET(ecptnc), /* @tp_getset@ */
720 0, /* @tp_base@ */
721 0, /* @tp_dict@ */
722 0, /* @tp_descr_get@ */
723 0, /* @tp_descr_set@ */
724 0, /* @tp_dictoffset@ */
725 0, /* @tp_init@ */
726 PyType_GenericAlloc, /* @tp_alloc@ */
727 ecptnc_pynew, /* @tp_new@ */
728 0, /* @tp_free@ */
729 0 /* @tp_is_gc@ */
730 };
731
732 static const PyMemberDef ecpt_pymembers[] = {
733 #define MEMBERSTRUCT ecpt_pyobj
734 MEMRNM(curve, T_OBJECT, ob_type, READONLY,
735 "P.curve -> elliptic curve containing P")
736 #undef MEMBERSTRUCT
737 { 0 }
738 };
739
740 static const PyGetSetDef ecpt_pygetset[] = {
741 #define GETSETNAME(op, name) ep##op##_##name
742 GET (point, "P.point -> standalone curve point")
743 GET (x, "P.x -> Cartesian x coordinate of P")
744 GET (y, "P.y -> Cartesian y coordinate of P")
745 GET (_x, "P._x -> internal x coordinate of P")
746 GET (_y, "P._y -> internal y coordinate of P")
747 GET (_z, "P._z -> internal z coordinate of P, or None")
748 #undef GETSETNAME
749 { 0 }
750 };
751
752 static const PyMethodDef ecpt_pymethods[] = {
753 #define METHNAME(func) epmeth_##func
754 NAMETH(toraw, "X.toraw() -> BIN")
755 KWMETH(ec2osp, "X.ec2osp([flags = EC_EXPLY]) -> BIN")
756 NAMETH(dbl, "X.dbl() -> X + X")
757 NAMETH(oncurvep, "X.oncurvep() -> BOOL")
758 CMTH (fromraw, "fromraw(STR) -> (P, REST)")
759 KWCMTH(os2ecp, "os2ecp(STR, [flags = ...]) -> (P, REST)")
760 #undef METHNAME
761 { 0 }
762 };
763
764 static const PyNumberMethods ecptcurve_pynumber = {
765 ecpt_pyadd, /* @nb_add@ */
766 ecpt_pysub, /* @nb_subtract@ */
767 ecpt_pymul, /* @nb_multiply@ */
768 0, /* @nb_divide@ */
769 0, /* @nb_remainder@ */
770 0, /* @nb_divmod@ */
771 0, /* @nb_power@ */
772 ecpt_pyneg, /* @nb_negative@ */
773 ecpt_pyid, /* @nb_positive@ */
774 0, /* @nb_absolute@ */
775 0, /* @nb_nonzero@ */
776 0, /* @nb_invert@ */
777 0, /* @nb_lshift@ */
778 0, /* @nb_rshift@ */
779 0, /* @nb_and@ */
780 0, /* @nb_xor@ */
781 0, /* @nb_or@ */
782 0, /* @nb_coerce@ */
783 0, /* @nb_int@ */
784 0, /* @nb_long@ */
785 0, /* @nb_float@ */
786 0, /* @nb_oct@ */
787 0, /* @nb_hex@ */
788
789 0, /* @nb_inplace_add@ */
790 0, /* @nb_inplace_subtract@ */
791 0, /* @nb_inplace_multiply@ */
792 0, /* @nb_inplace_divide@ */
793 0, /* @nb_inplace_remainder@ */
794 0, /* @nb_inplace_power@ */
795 0, /* @nb_inplace_lshift@ */
796 0, /* @nb_inplace_rshift@ */
797 0, /* @nb_inplace_and@ */
798 0, /* @nb_inplace_xor@ */
799 0, /* @nb_inplace_or@ */
800
801 0, /* @nb_floor_divide@ */
802 0, /* @nb_true_divide@ */
803 0, /* @nb_inplace_floor_divide@ */
804 0, /* @nb_inplace_true_divide@ */
805 };
806
807 static const PyTypeObject ecptcurve_pytype_skel = {
808 PyVarObject_HEAD_INIT(0, 0) /* Header */
809 "ECPtCurve", /* @tp_name@ */
810 sizeof(ecpt_pyobj), /* @tp_basicsize@ */
811 0, /* @tp_itemsize@ */
812
813 ecpt_pydealloc, /* @tp_dealloc@ */
814 0, /* @tp_print@ */
815 0, /* @tp_getattr@ */
816 0, /* @tp_setattr@ */
817 0, /* @tp_compare@ */
818 0, /* @tp_repr@ */
819 PYNUMBER(ecptcurve), /* @tp_as_number@ */
820 0, /* @tp_as_sequence@ */
821 0, /* @tp_as_mapping@ */
822 0, /* @tp_hash@ */
823 0, /* @tp_call@ */
824 0, /* @tp_str@ */
825 0, /* @tp_getattro@ */
826 0, /* @tp_setattro@ */
827 0, /* @tp_as_buffer@ */
828 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
829 Py_TPFLAGS_CHECKTYPES |
830 Py_TPFLAGS_BASETYPE,
831
832 /* @tp_doc@ */
833 "Elliptic curve points; abstract base class for points on given curves.",
834
835 0, /* @tp_traverse@ */
836 0, /* @tp_clear@ */
837 0, /* @tp_richcompare@ */
838 0, /* @tp_weaklistoffset@ */
839 0, /* @tp_iter@ */
840 0, /* @tp_iternext@ */
841 PYMETHODS(ecpt), /* @tp_methods@ */
842 PYMEMBERS(ecpt), /* @tp_members@ */
843 PYGETSET(ecpt), /* @tp_getset@ */
844 0, /* @tp_base@ */
845 0, /* @tp_dict@ */
846 0, /* @tp_descr_get@ */
847 0, /* @tp_descr_set@ */
848 0, /* @tp_dictoffset@ */
849 0, /* @tp_init@ */
850 PyType_GenericAlloc, /* @tp_alloc@ */
851 abstract_pynew, /* @tp_new@ */
852 0, /* @tp_free@ */
853 0 /* @tp_is_gc@ */
854 };
855
856 /*----- Elliptic curves themselves ----------------------------------------*/
857
858 static PyObject *eccurve_pyrichcompare(PyObject *x, PyObject *y, int op)
859 {
860 int b;
861
862 assert(ECCURVE_PYCHECK(x));
863 if (!ECCURVE_PYCHECK(y)) RETURN_NOTIMPL;
864 b = ec_samep(ECCURVE_C(x), ECCURVE_C(y));
865 switch (op) {
866 case Py_EQ: break;
867 case Py_NE: b = !b; break;
868 default: TYERR("can't order elliptic curves");
869 }
870 return (getbool(b));
871 end:
872 return (0);
873 }
874
875 static PyObject *ecmmul_id(PyObject *me)
876 { ec p = EC_INIT; return (ecpt_pywrap(me, &p)); }
877
878 static int ecmmul_fill(void *pp, PyObject *me, PyObject *x, PyObject *m)
879 {
880 ec_mulfactor *f = pp;
881
882 EC_CREATE(&f->base);
883 if (getecpt(ECCURVE_C(me), &f->base, x) ||
884 (f->exp = getmp(m)) == 0)
885 return (-1);
886 return (0);
887 }
888
889 static PyObject *ecmmul_exp(PyObject *me, void *pp, int n)
890 {
891 ec p = EC_INIT;
892 ec_immul(ECCURVE_C(me), &p, pp, n);
893 return (ecpt_pywrap(me, &p));
894 }
895
896 static void ecmmul_drop(void *pp)
897 {
898 ec_mulfactor *f = pp;
899 EC_DESTROY(&f->base);
900 MP_DROP(f->exp);
901 }
902
903 static PyObject *ecmeth_mmul(PyObject *me, PyObject *arg)
904 {
905 return (mexp_common(me, arg, sizeof(ec_mulfactor),
906 ecmmul_id, ecmmul_fill, ecmmul_exp, ecmmul_drop));
907 }
908
909 static void eccurve_pydealloc(PyObject *me)
910 {
911 ec_destroycurve(ECCURVE_C(me));
912 Py_DECREF(ECCURVE_FOBJ(me));
913 PyType_Type.tp_dealloc(me);
914 }
915
916 static PyObject *ecmeth_find(PyObject *me, PyObject *arg)
917 {
918 PyObject *x;
919 mp *xx = 0;
920 ec p = EC_INIT;
921 PyObject *rc = 0;
922
923 if (!PyArg_ParseTuple(arg, "O:find", &x)) goto end;
924 if (FIELD_PYCHECK(x) && FE_F(x) == ECCURVE_C(me)->f)
925 xx = MP_COPY(FE_X(x));
926 else if ((xx = getmp(x)) == 0)
927 goto end;
928 else
929 xx = F_IN(ECCURVE_C(me)->f, xx, xx);
930 if (EC_FIND(ECCURVE_C(me), &p, xx) == 0)
931 VALERR("not on the curve");
932 rc = ecpt_pywrap(me, &p);
933 end:
934 if (xx) MP_DROP(xx);
935 return (rc);
936 }
937
938 static PyObject *ecmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
939 {
940 static const char *const kwlist[] = { "rng", 0 };
941 grand *r = &rand_global;
942 ec p = EC_INIT;
943
944 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", KWLIST,
945 convgrand, &r))
946 return (0);
947 ec_rand(ECCURVE_C(me), &p, r);
948 EC_IN(ECCURVE_C(me), &p, &p);
949 return (ecpt_pywrap(me, &p));
950 }
951
952 static PyObject *ecmeth_parse(PyObject *me, PyObject *arg)
953 {
954 char *p;
955 qd_parse qd;
956 ec_curve *c;
957 PyObject *rc = 0;
958
959 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
960 qd.p = p; qd.e = 0;
961 if ((c = ec_curveparse(&qd)) == 0) VALERR(qd.e);
962 rc = eccurve_pywrap(0, c);
963 end:
964 return (rc);
965 }
966
967 static PyObject *eccurve_dopywrap(PyTypeObject *ty,
968 PyObject *fobj, ec_curve *c)
969 {
970 eccurve_pyobj *cobj = newtype(ty, 0, c->ops->name);
971 cobj->c = c;
972 cobj->fobj = fobj;
973 cobj->ty.ht_type.tp_basicsize = sizeof(ecpt_pyobj);
974 cobj->ty.ht_type.tp_base = ecptcurve_pytype;
975 Py_INCREF(ecptcurve_pytype);
976 cobj->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
977 Py_TPFLAGS_BASETYPE |
978 Py_TPFLAGS_CHECKTYPES |
979 Py_TPFLAGS_HEAPTYPE);
980 cobj->ty.ht_type.tp_alloc = PyType_GenericAlloc;
981 cobj->ty.ht_type.tp_free = 0;
982 cobj->ty.ht_type.tp_new = ecpt_pynew;
983 typeready(&cobj->ty.ht_type);
984 return ((PyObject *)cobj);
985 }
986
987 PyObject *eccurve_pywrap(PyObject *fobj, ec_curve *c)
988 {
989 PyTypeObject *ty;
990
991 if (!fobj)
992 fobj = field_pywrap(c->f);
993 else
994 Py_INCREF(fobj);
995 assert(FIELD_F(fobj) == c->f);
996 if (STRCMP(EC_NAME(c), ==, "prime"))
997 ty = ecprimecurve_pytype;
998 else if (STRCMP(EC_NAME(c), ==, "primeproj"))
999 ty = ecprimeprojcurve_pytype;
1000 else if (STRCMP(EC_NAME(c), ==, "bin"))
1001 ty = ecbincurve_pytype;
1002 else if (STRCMP(EC_NAME(c), ==, "binproj"))
1003 ty = ecbinprojcurve_pytype;
1004 else
1005 abort();
1006 return (eccurve_dopywrap(ty, fobj, c));
1007 }
1008
1009 static PyObject *eccurve_pynew(PyTypeObject *ty,
1010 ec_curve *(*make)(field *, mp *, mp *),
1011 PyObject *arg, PyObject *kw)
1012 {
1013 PyObject *fobj;
1014 PyObject *cobj = 0;
1015 static const char *const kwlist[] = { "field", "a", "b", 0 };
1016 mp *aa = 0, *bb = 0;
1017
1018 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O&O&", KWLIST,
1019 field_pytype, &fobj,
1020 convmp, &aa, convmp, &bb))
1021 goto end;
1022 Py_INCREF(fobj);
1023 cobj = eccurve_dopywrap(ty, fobj, make(FIELD_F(fobj), aa, bb));
1024 end:
1025 if (aa) MP_DROP(aa);
1026 if (bb) MP_DROP(bb);
1027 return (cobj);
1028 }
1029
1030 static PyObject *ecget_name(PyObject *me, void *hunoz)
1031 { return (TEXT_FROMSTR(EC_NAME(ECCURVE_C(me)))); }
1032
1033 static PyObject *ecget_a(PyObject *me, void *hunoz)
1034 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->a))); }
1035
1036 static PyObject *ecget_b(PyObject *me, void *hunoz)
1037 { return (fe_pywrap(ECCURVE_FOBJ(me), MP_COPY(ECCURVE_C(me)->b))); }
1038
1039 static PyObject *ecget_field(PyObject *me, void *hunoz)
1040 { RETURN_OBJ(ECCURVE_FOBJ(me)); }
1041
1042 static PyObject *ecget_inf(PyObject *me, void *hunoz)
1043 { ec inf = EC_INIT; return (ecpt_pywrap(me, &inf)); }
1044
1045 static const PyGetSetDef eccurve_pygetset[] = {
1046 #define GETSETNAME(op, name) ec##op##_##name
1047 GET (name, "E.name -> name of this kind of curve")
1048 GET (a, "E.a -> first parameter of curve")
1049 GET (b, "E.b -> second parameter of curve")
1050 GET (field, "E.field -> finite field containing this curve")
1051 GET (inf, "E.inf -> point at infinity of this curve")
1052 #undef GETSETNAME
1053 { 0 }
1054 };
1055
1056 static const PyMethodDef eccurve_pymethods[] = {
1057 #define METHNAME(name) ecmeth_##name
1058 METH (mmul, "E.mmul([(P0, N0), (P1, N1), ...]) = N0 P0 + N1 P1 + ...")
1059 METH (find, "E.find(X) -> P")
1060 KWMETH(rand, "E.rand([rng = rand]) -> P")
1061 SMTH (parse, "parse(STR) -> (E, REST)")
1062 #undef METHNAME
1063 { 0 }
1064 };
1065
1066 static const PyTypeObject eccurve_pytype_skel = {
1067 PyVarObject_HEAD_INIT(0, 0) /* Header */
1068 "ECCurve", /* @tp_name@ */
1069 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1070 0, /* @tp_itemsize@ */
1071
1072 eccurve_pydealloc, /* @tp_dealloc@ */
1073 0, /* @tp_print@ */
1074 0, /* @tp_getattr@ */
1075 0, /* @tp_setattr@ */
1076 0, /* @tp_compare@ */
1077 0, /* @tp_repr@ */
1078 0, /* @tp_as_number@ */
1079 0, /* @tp_as_sequence@ */
1080 0, /* @tp_as_mapping@ */
1081 0, /* @tp_hash@ */
1082 0, /* @tp_call@ */
1083 0, /* @tp_str@ */
1084 0, /* @tp_getattro@ */
1085 0, /* @tp_setattro@ */
1086 0, /* @tp_as_buffer@ */
1087 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1088 Py_TPFLAGS_BASETYPE,
1089
1090 /* @tp_doc@ */
1091 "An elliptic curve. Abstract class.",
1092
1093 0, /* @tp_traverse@ */
1094 0, /* @tp_clear@ */
1095 eccurve_pyrichcompare, /* @tp_richcompare@ */
1096 0, /* @tp_weaklistoffset@ */
1097 0, /* @tp_iter@ */
1098 0, /* @tp_iternext@ */
1099 PYMETHODS(eccurve), /* @tp_methods@ */
1100 0, /* @tp_members@ */
1101 PYGETSET(eccurve), /* @tp_getset@ */
1102 0, /* @tp_base@ */
1103 0, /* @tp_dict@ */
1104 0, /* @tp_descr_get@ */
1105 0, /* @tp_descr_set@ */
1106 0, /* @tp_dictoffset@ */
1107 0, /* @tp_init@ */
1108 PyType_GenericAlloc, /* @tp_alloc@ */
1109 abstract_pynew, /* @tp_new@ */
1110 0, /* @tp_free@ */
1111 0 /* @tp_is_gc@ */
1112 };
1113
1114 static PyObject *ecprimecurve_pynew(PyTypeObject *ty,
1115 PyObject *arg, PyObject *kw)
1116 {
1117 return (eccurve_pynew(ty, ec_prime, arg, kw));
1118 }
1119
1120 static const PyTypeObject ecprimecurve_pytype_skel = {
1121 PyVarObject_HEAD_INIT(0, 0) /* Header */
1122 "ECPrimeCurve", /* @tp_name@ */
1123 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1124 0, /* @tp_itemsize@ */
1125
1126 eccurve_pydealloc, /* @tp_dealloc@ */
1127 0, /* @tp_print@ */
1128 0, /* @tp_getattr@ */
1129 0, /* @tp_setattr@ */
1130 0, /* @tp_compare@ */
1131 0, /* @tp_repr@ */
1132 0, /* @tp_as_number@ */
1133 0, /* @tp_as_sequence@ */
1134 0, /* @tp_as_mapping@ */
1135 0, /* @tp_hash@ */
1136 0, /* @tp_call@ */
1137 0, /* @tp_str@ */
1138 0, /* @tp_getattro@ */
1139 0, /* @tp_setattro@ */
1140 0, /* @tp_as_buffer@ */
1141 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1142 Py_TPFLAGS_BASETYPE,
1143
1144 /* @tp_doc@ */
1145 "ECPrimeCurve(FIELD, A, B): an elliptic curve over a prime field.\n"
1146 " Use ECPrimeProjCurve instead.",
1147
1148 0, /* @tp_traverse@ */
1149 0, /* @tp_clear@ */
1150 eccurve_pyrichcompare, /* @tp_richcompare@ */
1151 0, /* @tp_weaklistoffset@ */
1152 0, /* @tp_iter@ */
1153 0, /* @tp_iternext@ */
1154 0, /* @tp_methods@ */
1155 0, /* @tp_members@ */
1156 0, /* @tp_getset@ */
1157 0, /* @tp_base@ */
1158 0, /* @tp_dict@ */
1159 0, /* @tp_descr_get@ */
1160 0, /* @tp_descr_set@ */
1161 0, /* @tp_dictoffset@ */
1162 0, /* @tp_init@ */
1163 PyType_GenericAlloc, /* @tp_alloc@ */
1164 ecprimecurve_pynew, /* @tp_new@ */
1165 0, /* @tp_free@ */
1166 0 /* @tp_is_gc@ */
1167 };
1168
1169 static PyObject *ecprimeprojcurve_pynew(PyTypeObject *ty,
1170 PyObject *arg, PyObject *kw)
1171 {
1172 return (eccurve_pynew(ty, ec_primeproj, arg, kw));
1173 }
1174
1175 static const PyTypeObject ecprimeprojcurve_pytype_skel = {
1176 PyVarObject_HEAD_INIT(0, 0) /* Header */
1177 "ECPrimeProjCurve", /* @tp_name@ */
1178 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1179 0, /* @tp_itemsize@ */
1180
1181 eccurve_pydealloc, /* @tp_dealloc@ */
1182 0, /* @tp_print@ */
1183 0, /* @tp_getattr@ */
1184 0, /* @tp_setattr@ */
1185 0, /* @tp_compare@ */
1186 0, /* @tp_repr@ */
1187 0, /* @tp_as_number@ */
1188 0, /* @tp_as_sequence@ */
1189 0, /* @tp_as_mapping@ */
1190 0, /* @tp_hash@ */
1191 0, /* @tp_call@ */
1192 0, /* @tp_str@ */
1193 0, /* @tp_getattro@ */
1194 0, /* @tp_setattro@ */
1195 0, /* @tp_as_buffer@ */
1196 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1197 Py_TPFLAGS_BASETYPE,
1198
1199 /* @tp_doc@ */
1200 "ECPrimeProjCurve(FIELD, A, B): an elliptic curve over a prime field\n"
1201 " using projective coordinates.",
1202
1203 0, /* @tp_traverse@ */
1204 0, /* @tp_clear@ */
1205 eccurve_pyrichcompare, /* @tp_richcompare@ */
1206 0, /* @tp_weaklistoffset@ */
1207 0, /* @tp_iter@ */
1208 0, /* @tp_iternext@ */
1209 0, /* @tp_methods@ */
1210 0, /* @tp_members@ */
1211 0, /* @tp_getset@ */
1212 0, /* @tp_base@ */
1213 0, /* @tp_dict@ */
1214 0, /* @tp_descr_get@ */
1215 0, /* @tp_descr_set@ */
1216 0, /* @tp_dictoffset@ */
1217 0, /* @tp_init@ */
1218 PyType_GenericAlloc, /* @tp_alloc@ */
1219 ecprimeprojcurve_pynew, /* @tp_new@ */
1220 0, /* @tp_free@ */
1221 0 /* @tp_is_gc@ */
1222 };
1223
1224 static PyObject *ecbincurve_pynew(PyTypeObject *ty,
1225 PyObject *arg, PyObject *kw)
1226 {
1227 return (eccurve_pynew(ty, ec_bin, arg, kw));
1228 }
1229
1230 static const PyTypeObject ecbincurve_pytype_skel = {
1231 PyVarObject_HEAD_INIT(0, 0) /* Header */
1232 "ECBinCurve", /* @tp_name@ */
1233 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1234 0, /* @tp_itemsize@ */
1235
1236 eccurve_pydealloc, /* @tp_dealloc@ */
1237 0, /* @tp_print@ */
1238 0, /* @tp_getattr@ */
1239 0, /* @tp_setattr@ */
1240 0, /* @tp_compare@ */
1241 0, /* @tp_repr@ */
1242 0, /* @tp_as_number@ */
1243 0, /* @tp_as_sequence@ */
1244 0, /* @tp_as_mapping@ */
1245 0, /* @tp_hash@ */
1246 0, /* @tp_call@ */
1247 0, /* @tp_str@ */
1248 0, /* @tp_getattro@ */
1249 0, /* @tp_setattro@ */
1250 0, /* @tp_as_buffer@ */
1251 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1252 Py_TPFLAGS_BASETYPE,
1253
1254 /* @tp_doc@ */
1255 "ECBinCurve(FIELD, A, B): an elliptic curve over a binary field.\n"
1256 " Use ECBinProjCurve instead.",
1257
1258 0, /* @tp_traverse@ */
1259 0, /* @tp_clear@ */
1260 eccurve_pyrichcompare, /* @tp_richcompare@ */
1261 0, /* @tp_weaklistoffset@ */
1262 0, /* @tp_iter@ */
1263 0, /* @tp_iternext@ */
1264 0, /* @tp_methods@ */
1265 0, /* @tp_members@ */
1266 0, /* @tp_getset@ */
1267 0, /* @tp_base@ */
1268 0, /* @tp_dict@ */
1269 0, /* @tp_descr_get@ */
1270 0, /* @tp_descr_set@ */
1271 0, /* @tp_dictoffset@ */
1272 0, /* @tp_init@ */
1273 PyType_GenericAlloc, /* @tp_alloc@ */
1274 ecbincurve_pynew, /* @tp_new@ */
1275 0, /* @tp_free@ */
1276 0 /* @tp_is_gc@ */
1277 };
1278
1279 static PyObject *ecbinprojcurve_pynew(PyTypeObject *ty,
1280 PyObject *arg, PyObject *kw)
1281 {
1282 return (eccurve_pynew(ty, ec_binproj, arg, kw));
1283 }
1284
1285 static const PyTypeObject ecbinprojcurve_pytype_skel = {
1286 PyVarObject_HEAD_INIT(0, 0) /* Header */
1287 "ECBinProjCurve", /* @tp_name@ */
1288 sizeof(eccurve_pyobj), /* @tp_basicsize@ */
1289 0, /* @tp_itemsize@ */
1290
1291 eccurve_pydealloc, /* @tp_dealloc@ */
1292 0, /* @tp_print@ */
1293 0, /* @tp_getattr@ */
1294 0, /* @tp_setattr@ */
1295 0, /* @tp_compare@ */
1296 0, /* @tp_repr@ */
1297 0, /* @tp_as_number@ */
1298 0, /* @tp_as_sequence@ */
1299 0, /* @tp_as_mapping@ */
1300 0, /* @tp_hash@ */
1301 0, /* @tp_call@ */
1302 0, /* @tp_str@ */
1303 0, /* @tp_getattro@ */
1304 0, /* @tp_setattro@ */
1305 0, /* @tp_as_buffer@ */
1306 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1307 Py_TPFLAGS_BASETYPE,
1308
1309 /* @tp_doc@ */
1310 "ECBinProjCurve(FIELD, A, B): an elliptic curve over a binary field,\n"
1311 " using projective coordinates.",
1312
1313 0, /* @tp_traverse@ */
1314 0, /* @tp_clear@ */
1315 eccurve_pyrichcompare, /* @tp_richcompare@ */
1316 0, /* @tp_weaklistoffset@ */
1317 0, /* @tp_iter@ */
1318 0, /* @tp_iternext@ */
1319 0, /* @tp_methods@ */
1320 0, /* @tp_members@ */
1321 0, /* @tp_getset@ */
1322 0, /* @tp_base@ */
1323 0, /* @tp_dict@ */
1324 0, /* @tp_descr_get@ */
1325 0, /* @tp_descr_set@ */
1326 0, /* @tp_dictoffset@ */
1327 0, /* @tp_init@ */
1328 PyType_GenericAlloc, /* @tp_alloc@ */
1329 ecbinprojcurve_pynew, /* @tp_new@ */
1330 0, /* @tp_free@ */
1331 0 /* @tp_is_gc@ */
1332 };
1333
1334 /*----- Curve info --------------------------------------------------------*/
1335
1336 void ecinfo_copy(ec_info *eic, const ec_info *ei)
1337 {
1338 eic->c = eccurve_copy(ei->c);
1339 EC_CREATE(&eic->g);
1340 EC_COPY(&eic->g, &ei->g);
1341 eic->r = MP_COPY(ei->r);
1342 eic->h = MP_COPY(ei->h);
1343 }
1344
1345 PyObject *ecinfo_pywrap(ec_info *ei)
1346 {
1347 ecinfo_pyobj *o;
1348
1349 o = PyObject_NEW(ecinfo_pyobj, ecinfo_pytype);
1350 o->ei = *ei;
1351 o->cobj = eccurve_pywrap(0, o->ei.c);
1352 Py_INCREF(o->cobj);
1353 return ((PyObject *)o);
1354 }
1355
1356 static void ecinfo_pydealloc(PyObject *me)
1357 {
1358 ec_info *ei = ECINFO_EI(me);
1359 EC_DESTROY(&ei->g);
1360 MP_DROP(ei->r);
1361 MP_DROP(ei->h);
1362 Py_DECREF(ECINFO_COBJ(me));
1363 FREEOBJ(me);
1364 }
1365
1366 static PyObject *ecinfo_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
1367 {
1368 ec_info ei = { 0 };
1369 PyObject *e, *g;
1370 static const char *const kwlist[] = { "curve", "G", "r", "h", 0 };
1371 ecinfo_pyobj *rc = 0;
1372
1373 if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!O!O&O&:new", KWLIST,
1374 eccurve_pytype, &e, ecpt_pytype, &g,
1375 convmp, &ei.r, convmp, &ei.h))
1376 goto end;
1377 if (ECPT_C(g) != ECCURVE_C(e) && !ec_samep(ECPT_C(g), ECCURVE_C(e)))
1378 TYERR("point not from this curve");
1379 ei.c = ECCURVE_C(e);
1380 EC_CREATE(&ei.g);
1381 EC_OUT(ei.c, &ei.g, ECPT_P(g));
1382 rc = (ecinfo_pyobj *)ty->tp_alloc(ty, 0);
1383 rc->ei = ei;
1384 rc->cobj = e;
1385 Py_INCREF(rc->cobj);
1386 return ((PyObject *)rc);
1387
1388 end:
1389 mp_drop(ei.r);
1390 mp_drop(ei.h);
1391 return (0);
1392 }
1393
1394 static PyObject *eimeth_parse(PyObject *me, PyObject *arg)
1395 {
1396 char *p;
1397 qd_parse qd;
1398 ec_info ei;
1399 PyObject *rc = 0;
1400
1401 if (!PyArg_ParseTuple(arg, "s:parse", &p)) goto end;
1402 qd.p = p; qd.e = 0;
1403 if (ec_infoparse(&qd, &ei)) VALERR(qd.e);
1404 rc = Py_BuildValue("(Ns)", ecinfo_pywrap(&ei), qd.p);
1405 end:
1406 return (rc);
1407 }
1408
1409 static PyObject *ecinfo_pyrichcompare(PyObject *x, PyObject *y, int op)
1410 {
1411 int b = ec_sameinfop(ECINFO_EI(x), ECINFO_EI(y));
1412 switch (op) {
1413 case Py_EQ: break;
1414 case Py_NE: b = !b;
1415 default: TYERR("can't order elliptic curve infos");
1416 }
1417 return (getbool(b));
1418 end:
1419 return (0);
1420 }
1421
1422 static PyObject *eimeth_check(PyObject *me, PyObject *arg, PyObject *kw)
1423 {
1424 static const char *const kwlist[] = { "rng", 0 };
1425 grand *r = &rand_global;
1426 const char *p;
1427
1428 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:check", KWLIST,
1429 convgrand, &r))
1430 goto end;
1431 if ((p = ec_checkinfo(ECINFO_EI(me), r)) != 0)
1432 VALERR(p);
1433 RETURN_ME;
1434 end:
1435 return (0);
1436 }
1437
1438 static PyObject *eiget_curve(PyObject *me, void *hunoz)
1439 { RETURN_OBJ(ECINFO_COBJ(me)); }
1440
1441 static PyObject *eiget_G(PyObject *me, void *hunoz)
1442 {
1443 ec_info *ei = ECINFO_EI(me);
1444 ec p = EC_INIT;
1445 EC_IN(ei->c, &p, &ei->g);
1446 return (ecpt_pywrap(ECINFO_COBJ(me), &p));
1447 }
1448
1449 static PyObject *eiget_r(PyObject *me, void *hunoz)
1450 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->r))); }
1451
1452 static PyObject *eiget_h(PyObject *me, void *hunoz)
1453 { return (mp_pywrap(MP_COPY(ECINFO_EI(me)->h))); }
1454
1455 static const PyGetSetDef ecinfo_pygetset[] = {
1456 #define GETSETNAME(op, name) ei##op##_##name
1457 GET (curve, "I.curve -> the elliptic curve")
1458 GET (G, "I.G -> generator point for the group")
1459 GET (r, "I.r -> order of the group (and hence of G")
1460 GET (h, "I.h -> cofactor of the group")
1461 #undef GETSETNAME
1462 { 0 }
1463 };
1464
1465 static const PyMethodDef ecinfo_pymethods[] = {
1466 #define METHNAME(name) eimeth_##name
1467 KWMETH(check, "I.check([rng = rand]) -> None")
1468 SMTH (parse, "parse(STR) -> (I, REST)")
1469 #undef METHNAME
1470 { 0 }
1471 };
1472
1473 static const PyTypeObject ecinfo_pytype_skel = {
1474 PyVarObject_HEAD_INIT(0, 0) /* Header */
1475 "ECInfo", /* @tp_name@ */
1476 sizeof(ecinfo_pyobj), /* @tp_basicsize@ */
1477 0, /* @tp_itemsize@ */
1478
1479 ecinfo_pydealloc, /* @tp_dealloc@ */
1480 0, /* @tp_print@ */
1481 0, /* @tp_getattr@ */
1482 0, /* @tp_setattr@ */
1483 0, /* @tp_compare@ */
1484 0, /* @tp_repr@ */
1485 0, /* @tp_as_number@ */
1486 0, /* @tp_as_sequence@ */
1487 0, /* @tp_as_mapping@ */
1488 0, /* @tp_hash@ */
1489 0, /* @tp_call@ */
1490 0, /* @tp_str@ */
1491 0, /* @tp_getattro@ */
1492 0, /* @tp_setattro@ */
1493 0, /* @tp_as_buffer@ */
1494 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
1495 Py_TPFLAGS_BASETYPE,
1496
1497 /* @tp_doc@ */
1498 "ECInfo(CURVE, G, R, H): elliptic curve domain parameters.",
1499
1500 0, /* @tp_traverse@ */
1501 0, /* @tp_clear@ */
1502 ecinfo_pyrichcompare, /* @tp_richcompare@ */
1503 0, /* @tp_weaklistoffset@ */
1504 0, /* @tp_iter@ */
1505 0, /* @tp_iternext@ */
1506 PYMETHODS(ecinfo), /* @tp_methods@ */
1507 0, /* @tp_members@ */
1508 PYGETSET(ecinfo), /* @tp_getset@ */
1509 0, /* @tp_base@ */
1510 0, /* @tp_dict@ */
1511 0, /* @tp_descr_get@ */
1512 0, /* @tp_descr_set@ */
1513 0, /* @tp_dictoffset@ */
1514 0, /* @tp_init@ */
1515 PyType_GenericAlloc, /* @tp_alloc@ */
1516 ecinfo_pynew, /* @tp_new@ */
1517 0, /* @tp_free@ */
1518 0 /* @tp_is_gc@ */
1519 };
1520
1521 /*----- Setup -------------------------------------------------------------*/
1522
1523 static const struct nameval consts[] = {
1524 CONST(EC_XONLY), CONST(EC_YBIT), CONST(EC_LSB),
1525 CONST(EC_CMPR), CONST(EC_EXPLY), CONST(EC_SORT),
1526 { 0 }
1527 };
1528
1529 void ec_pyinit(void)
1530 {
1531 INITTYPE(ecpt, root);
1532 INITTYPE(ecptcurve, ecpt);
1533 INITTYPE(eccurve, type);
1534 INITTYPE(ecprimecurve, eccurve);
1535 INITTYPE(ecprimeprojcurve, ecprimecurve);
1536 INITTYPE(ecbincurve, eccurve);
1537 INITTYPE(ecbinprojcurve, ecbincurve);
1538 INITTYPE(ecinfo, root);
1539 }
1540
1541 static const char *ec_namefn(const void *p)
1542 { const ecentry *ec = p; return (ec->name); }
1543
1544 static int ec_ixfn(const void *p)
1545 {
1546 const ecentry *ec = p;
1547 int i;
1548
1549 for (i = 0; ectab[i].name; i++)
1550 if (ectab[i].data == ec->data) return (i);
1551 return (-1);
1552 }
1553
1554 static PyObject *ec_valfn(int i)
1555 {
1556 ec_info ei;
1557
1558 ec_infofromdata(&ei, ectab[i].data);
1559 return (ecinfo_pywrap(&ei));
1560 }
1561
1562 void ec_pyinsert(PyObject *mod)
1563 {
1564 INSERT("ECPt", ecpt_pytype);
1565 INSERT("ECPtCurve", ecptcurve_pytype);
1566 INSERT("ECCurve", eccurve_pytype);
1567 INSERT("ECPrimeCurve", ecprimecurve_pytype);
1568 INSERT("ECPrimeProjCurve", ecprimeprojcurve_pytype);
1569 INSERT("ECBinCurve", ecbincurve_pytype);
1570 INSERT("ECBinProjCurve", ecbinprojcurve_pytype);
1571 INSERT("ECInfo", ecinfo_pytype);
1572 INSERT("eccurves", make_grouptab(ectab, sizeof(*ectab),
1573 ec_namefn, ec_ixfn, ec_valfn));
1574 setconstants(mod, consts);
1575 }
1576
1577 /*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library -- Python bindings